Manifestation of geometric quantization effects in temperature behavior of AC magnetic response of Josephson Junction Arrays
arXiv:cond-mat/0506391 · doi:10.1134/1.1851638
Abstract
By improving resolution of home-made mutual-inductance measurements technique, a pronounced step-like structure (with the number of steps n=4 for all AC fields) has been observed in the temperature dependence of AC susceptibility in artificially prepared two-dimensional Josephson Junction Arrays (2D-JJA) of unshunted Nb-AlO_x-Nb junctions with β_L(4.2K)=30. Using a single-plaquette approximation of the overdamped 2D-JJA model, we were able to successfully fit our data assuming that steps are related to the geometric properties of the plaquette. The number of steps n corresponds to the number of flux quanta that can be screened by the maximum critical current of the junctions. The steps are predicted to manifest themselves in arrays with the inductance related parameter β_L(T) matching a "quantization" condition β_L(0)=2π(n+1).
4 pages (jetpl style), 3 figures
References in corpus (3)
Cited by in corpus (10)
- Dynamical reentrance and geometry imposed quantization effects in Nb-AlOx-Nb Josephson junction arrays
- Manifestation of geometric resonance in current dependence of AC susceptibility for unshunted array of Nb-AlOx-Nb Josephson junctions
- Evidence for resonant scattering of electrons by spin fluctuations in heterostructures grown by pulsed laser deposition
- Thermal expansion of Josephson junctions as an elastic response to an effective stress field
- Universal R-C crossover in current-voltage characteristics for unshunted array of overdamped Nb-AlO_x-Nb Josephson junctions
- Unusually strong coherent response from grain-boundary Josephson network in polycrystalline Pr_{x}Y_{1-x}Ba_2Cu_3O_7
- Magnetic field induced polarization effects in intrinsically granular superconductors
- Pinning of spiral fluxons by giant screw dislocations in YBa_2Cu_3O_7 single crystals: Josephson analog of the fishtail effect
- Novel magnetoinductance effects in Josephson Junction Arrays: A single-plaquette approximation
- On Field Induced Diaelastic Effect in a Small Josephson Contact